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Fluid-Soil-Structure interaction in liquefaction around coastal structures

Fluid-Soil-Structure interaction in liquefaction around coastal structures. WP2. Pierre Foray – David Bonjean Hervé Michallet INPG. Plan. Introduction Experimental Set-up Transducers accuracy analysis Experimental results Conclusion / Perspectives. Introduction. Methodology.

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Fluid-Soil-Structure interaction in liquefaction around coastal structures

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  1. Fluid-Soil-Structure interaction in liquefaction around coastal structures WP2 Pierre Foray – David Bonjean Hervé Michallet INPG

  2. Plan • Introduction • Experimental Set-up • Transducers accuracy analysis • Experimental results • Conclusion / Perspectives

  3. Introduction

  4. Methodology • Physical modelling of the wave action on a pipe partly buried or resting on the seabed • Full scale modelling of the pipe • Wave action simulated by a mechanical cyclic loading • Emphasis in accurate pore pressure measurements • Link with cyclic undrained/partially drained behaviour of sands

  5. Experimental Set-up

  6. Seabed physical model Medium to fine Fontainebleau sand (d25 = 0,25 mm) Dry pluviation system, controlled falling height Low uplift hydraulic gradient

  7. Hydrodynamic forces model Trolley supporting the pipe Horizontal electric actuator horizontal cyclic efforts on the trolley Vertical pneumatic actuator weight of a real pipe & lift effect

  8. Instrumentation scheme of the pipe

  9. Set up of the Trolley

  10. Transducers accuracy analysis Questions : * Influence of the porous stone * Air bubbles apparitions ?

  11. Influence of desaturation on pore pressure transducer response time

  12. Influence of a porous stone on transducer response time

  13. Experimental results

  14. Pipe displacement :dense sand,Fhmax = 50 daN, period = 2s,160 cycles.

  15. Trenching : loose sand, period : 4 s.

  16. Pore pressure recordings (30°)Fhmax = 50 daN, period = 4s

  17. Pore pressure recordings (45°)Fhmax = 50 daN, period = 4s

  18. Trenching : dense sand, period : 2 s.

  19. Compared Total/Pore pressure recordings (30°)Fhmax = 50 daN, period = 2s

  20. Peaks in Pore pressure recordings (30°)Fhmax = 50 daN, period = 2s

  21. ZOOM : Sand-Pipe Interface

  22. Conclusion / Perspectives Parametric study : sand density, period, Fhmax. Video image processing : displacement & velocity fields. The PANDA

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